Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 31.063295] BUG: Bad rss-counter state mm:0000000002636a4a type:MM_FILEPAGES val:33 [ 31.064740] BUG: Bad rss-counter state mm:0000000002636a4a type:MM_ANONPAGES val:22 [ 31.101891] ================================================================== [ 31.102820] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 31.103754] Read of size 8 at addr ffff88800ca68228 by task sshd/220 [ 31.104619] [ 31.104843] CPU: 0 PID: 220 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 31.105718] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 31.106731] Call Trace: [ 31.107057] [ 31.107342] dump_stack_lvl+0x91/0xf0 [ 31.107845] print_report+0xcc/0x620 [ 31.108336] ? __virt_addr_valid+0x102/0x340 [ 31.108889] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.109514] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.110155] kasan_report+0xbe/0xf0 [ 31.110633] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.111270] vma_interval_tree_remove+0xc75/0xec0 [ 31.111878] vma_prepare+0xc54/0x11a0 [ 31.112351] __split_vma+0x5af/0x950 [ 31.112827] ? __pfx___split_vma+0x10/0x10 [ 31.113365] ? find_held_lock+0x2c/0x110 [ 31.113985] do_vmi_align_munmap+0x2ba/0x11f0 [ 31.114550] ? lock_is_held_type+0x9f/0x120 [ 31.115096] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 31.115705] ? mtree_range_walk+0x632/0x900 [ 31.116259] ? mas_walk+0x5c7/0x7c0 [ 31.116742] do_vmi_munmap+0x1f1/0x2b0 [ 31.117241] mmap_region+0x1f9/0x2660 [ 31.117735] ? vm_mmap_pgoff+0x15c/0x3a0 [ 31.118252] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 31.118974] ? __pfx_lock_acquire+0x10/0x10 [ 31.119508] ? __pfx_mmap_region+0x10/0x10 [ 31.120045] ? security_mmap_addr+0x7d/0xa0 [ 31.120585] ? get_unmapped_area+0x1f5/0x3f0 [ 31.121139] do_mmap+0x854/0xf00 [ 31.121580] vm_mmap_pgoff+0x1a6/0x3a0 [ 31.122097] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 31.122668] ksys_mmap_pgoff+0x3af/0x500 [ 31.123178] do_syscall_64+0x3f/0x90 [ 31.123661] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.124323] RIP: 0033:0x7fcd1088fd82 [ 31.124782] Code: eb aa 66 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 33 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 56 5b 5d c3 0f 1f 00 c7 05 ae 03 01 00 16 00 [ 31.126944] RSP: 002b:00007fff565cfca8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 31.127847] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fcd1088fd82 [ 31.128692] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fcd0fcc9000 [ 31.129544] RBP: 00007fcd0fcc9000 R08: 0000000000000009 R09: 0000000000001000 [ 31.130406] R10: 0000000000000812 R11: 0000000000000206 R12: 0000564193d46980 [ 31.131255] R13: 00007fff565cfcc0 R14: 00007fff565cfcf0 R15: 00007fff565d0050 [ 31.132122] [ 31.132416] [ 31.132636] Allocated by task 213: [ 31.133072] kasan_save_stack+0x22/0x50 [ 31.133575] kasan_set_track+0x25/0x30 [ 31.134099] __kasan_slab_alloc+0x59/0x70 [ 31.134626] kmem_cache_alloc+0x16b/0x370 [ 31.135144] vm_area_dup+0x20/0x160 [ 31.135605] __split_vma+0x170/0x950 [ 31.136078] split_vma+0xc6/0x110 [ 31.136523] mprotect_fixup+0x8d2/0xb30 [ 31.137029] do_mprotect_pkey+0x87e/0xd40 [ 31.137547] __x64_sys_mprotect+0x78/0xc0 [ 31.138086] do_syscall_64+0x3f/0x90 [ 31.138571] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.139227] [ 31.139445] Freed by task 213: [ 31.139834] kasan_save_stack+0x22/0x50 [ 31.140340] kasan_set_track+0x25/0x30 [ 31.140838] kasan_save_free_info+0x2b/0x50 [ 31.141368] __kasan_slab_free+0x10a/0x190 [ 31.141914] kmem_cache_free+0x10d/0x4d0 [ 31.142426] rcu_core+0x8c8/0x2860 [ 31.142873] __do_softirq+0x1b7/0x7d4 [ 31.143351] [ 31.143570] Last potentially related work creation: [ 31.144155] kasan_save_stack+0x22/0x50 [ 31.144662] __kasan_record_aux_stack+0x8e/0xa0 [ 31.145249] __call_rcu_common.constprop.0+0x6a/0xb90 [ 31.145931] remove_vma+0x139/0x170 [ 31.146399] do_vmi_align_munmap+0xd4a/0x11f0 [ 31.146993] do_vmi_munmap+0x1f1/0x2b0 [ 31.147502] __vm_munmap+0x138/0x3a0 [ 31.148000] __x64_sys_munmap+0x59/0x80 [ 31.148541] do_syscall_64+0x3f/0x90 [ 31.149057] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.149748] [ 31.149974] The buggy address belongs to the object at ffff88800ca681d0 [ 31.149974] which belongs to the cache vm_area_struct of size 168 [ 31.151514] The buggy address is located 88 bytes inside of [ 31.151514] freed 168-byte region [ffff88800ca681d0, ffff88800ca68278) [ 31.152976] [ 31.153200] The buggy address belongs to the physical page: [ 31.153902] page:00000000cbe80247 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xca68 [ 31.155026] memcg:ffff88800d749801 [ 31.155478] anon flags: 0x100000000000200(slab|node=0|zone=1) [ 31.156208] page_type: 0xffffffff() [ 31.156676] raw: 0100000000000200 ffff8880087a0c80 0000000000000000 dead000000000001 [ 31.157673] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800d749801 [ 31.158628] page dumped because: kasan: bad access detected [ 31.159339] [ 31.159568] Memory state around the buggy address: [ 31.160175] ffff88800ca68100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.161086] ffff88800ca68180: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb [ 31.161994] >ffff88800ca68200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc [ 31.162908] ^ [ 31.163492] ffff88800ca68280: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 [ 31.164391] ffff88800ca68300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 31.165303] ================================================================== [ 31.166454] Disabling lock debugging due to kernel taint [ 33.170207] BUG: Bad rss-counter state mm:0000000006267f79 type:MM_FILEPAGES val:33 [ 33.171443] BUG: Bad rss-counter state mm:0000000006267f79 type:MM_ANONPAGES val:22 [ 33.571610] BUG: Bad rss-counter state mm:00000000ac568788 type:MM_FILEPAGES val:33 [ 33.572589] BUG: Bad rss-counter state mm:00000000ac568788 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:46873' (ECDSA) to the list of known hosts. 2023/06/20 11:45:32 fuzzer started 2023/06/20 11:45:32 dialing manager at localhost:36067 2023/06/20 11:45:33 checking machine... 2023/06/20 11:45:33 checking revisions... [ 34.272392] kmemleak: Automatic memory scanning thread ended 2023/06/20 11:45:33 testing simple program... [ 34.321404] cgroup: Unknown subsys name 'net' [ 34.374800] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:45:32 Registers: info registers vcpu 0 RAX=dffffc0000000000 RBX=ffff8880164f0b00 RCX=0000000000000000 RDX=1ffff11001cc842b RSI=ffffffff8186b8f7 RDI=ffff88800e642000 RBP=ffff88800e642000 RSP=ffff88800e4f7aa8 R8 =0000000000000001 R9 =ffffed1002c9e160 R10=ffff8880164f0b03 R11=00000000000b6a61 R12=0000000000008000 R13=ffff8880164f0b00 R14=0000000000000000 R15=ffff88800e4f7df0 RIP=ffffffff81ef1104 RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007f87d4e37900 00000000 00000000 GS =0000 ffff88806ce00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007ffeb103b000 CR3=000000000ede4000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=635f6e6f69737365733a4d41503d706f XMM01=6f6c5f6d61702c78756e696c65735f6d XMM02=61702c74696d7265705f6d61702c7469 XMM03=655f6d61702c7374696d696c5f6d6170 XMM04=3d6c616e696d72657420322e322e302e XMM05=3d656d616e74736f682022646873732f XMM06=746f6f72223d746363612078756e696c XMM07=6e655f6d61702c7374696d696c5f6d61 XMM08=652075253d64692073253d706f000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000000000002 RBX=ffff88806cf09a50 RCX=ffffffff860a1401 RDX=1ffff1100d9e134a RSI=0000000000000000 RDI=ffff88806cf09a50 RBP=ffff88806cf09ae8 RSP=ffff88806cf09a38 R8 =ffffffff860a1444 R9 =ffff88806cf09a90 R10=0000000000038001 R11=000000000000792d R12=ffff88806cf09b18 R13=0000000000000000 R14=ffff888008d951c0 R15=ffff8880166b9200 RIP=ffffffff81130368 RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 ffff88806cf00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f05b75dec48 CR3=0000000013a98000 CR4=00350ee0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000000000000000000000000000 XMM01=455f68dce3778ba5d44fa645a1d928f6 XMM02=2c67c8bc2e329bc3000000000011f3d8 XMM03=fb795ef6d657705600000000001220d0 XMM04=e97cc1816e648b5700000000000ae988 XMM05=19e9129bd510f2350000000000131ce0 XMM06=4fda316b135da52b0000000000131b68 XMM07=e042d86d42eb936e00000000001223a8 XMM08=94f335132959c3c5000000000011f438 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000